[gtk+] gtk-reftest: Clarify --direction argument parameters

[Benjamin Otte <otte src gnome org>]

commit 690fb31fb4b526c27c5ef4dd144b8802e3dc37c8
Author: Benjamin Otte <otte redhat com>
Date:   Sat May 31 04:52:53 2014 +0200

    gtk-reftest: Clarify --direction argument parameters
    
    ... and print a proper error message when the parameter is not
    recognized.

 testsuite/reftests/gtk-reftest.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/testsuite/reftests/gtk-reftest.c b/testsuite/reftests/gtk-reftest.c
index 70808f1..0e30d7c 100644
--- a/testsuite/reftests/gtk-reftest.c
+++ b/testsuite/reftests/gtk-reftest.c
@@ -44,7 +44,7 @@ static const GOptionEntry test_args[] = {
   { "directory",        'd', 0, G_OPTION_ARG_FILENAME, &arg_base_dir,
     "Directory to run tests from", "DIR" },
   { "direction",       0, 0, G_OPTION_ARG_STRING, &arg_direction,
-    "Set text direction", "DIRECTION" },
+    "Set text direction", "ltr|rtl" },
   { NULL }
 };
 
@@ -70,6 +70,8 @@ parse_command_line (int *argc, char ***argv)
     gtk_widget_set_default_direction (GTK_TEXT_DIR_RTL);
   else if (g_strcmp0 (arg_direction, "ltr") == 0)
     gtk_widget_set_default_direction (GTK_TEXT_DIR_LTR);
+  else
+    g_printerr ("Invalid argument passed to --direction argument. Valid arguments are 'ltr' and 'rtl'\n");
 
   return TRUE;
 }